A method for remediating groundwater containing organic pollutants

Abstract

This invention discloses a method for remediating groundwater containing organic pollutants, comprising the following steps: 1) Extracting groundwater containing organic pollutants using multiple extraction pumps, adding ferrous salts at a solid-liquid ratio of 1:50-200, mixing thoroughly, and adjusting the pH of the system to 6-8 to obtain intermediate treatment solution one; 2) Adding a remediation agent to the obtained intermediate treatment solution one, mixing and stirring for 3-6 hours to obtain intermediate treatment solution two; 3) Passing the obtained intermediate treatment solution two sequentially into an anaerobic reactor and an aerobic tank for treatment, and discharging after reaching the required standards; the packing material of the anaerobic reactor contains microorganisms, including at least two or more of denitrifying bacteria, Bacillus coagulans, Bacillus subtilis, Bacillus clonorchis, Bacillus indusiata, and Serratia marcescens. The remediation method provided by this invention has high remediation efficiency, thorough removal of organic matter, and is economically feasible, with an organic matter removal rate of over 98%.

Description

Technical Field

[0001] The present invention relates to the technical field of groundwater remediation, and more specifically, to a method for remediating groundwater containing organic pollutants. Background Art

[0002] At present, common groundwater remediation technologies at home and abroad include extraction and treatment technology, bioremediation technology, PRB permeable reaction wall technology, monitoring natural attenuation technology, plant remediation technology, in-situ chemical oxidation / reduction technology, etc. Although these methods can repair groundwater with organic pollutants to a certain extent, they all have their own shortcomings when treating groundwater with serious pollution such as landfill sites. In general, there are problems such as high treatment costs, incomplete remediation, and organic residues.

[0003] Therefore, how to provide a treatment method with high treatment effect, thorough removal of organic matter and economic feasibility is an urgent problem to be solved. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a method for remediating groundwater containing organic pollutants to solve the problems existing in the prior art.

[0005] To achieve the above object, the technical solution of the present invention is:

[0006] A method for remediating groundwater containing organic pollutants comprises the following steps:

[0007] 1) extracting groundwater containing organic pollutants through multiple extraction pumps, adding divalent iron salt at a solid-liquid ratio of 1:50-200, mixing, and adjusting the pH value of the system to 6-8 to obtain an intermediate treatment solution 1;

[0008] 2) Adding a repairing agent to the obtained intermediate treatment liquid 1, mixing and stirring for 3 to 6 hours to obtain an intermediate treatment liquid 2; the raw materials of the repairing agent include the following components:

[0009] 20-30 parts of flocculant, 15-25 parts of activated carbon, 20-30 parts of calcium oxide, 10-20 parts of 9,10-bis(3,5-dihydroxyphenyl)anthracene, 5-10 parts of methoxyphenol, and 3-6 parts of adhesive;

[0010] 3) The obtained intermediate treatment liquid II is sequentially passed into an anaerobic reactor and an aerobic tank for treatment, and discharged after reaching the standard; the filler of the anaerobic reactor contains microorganisms, and the microorganisms include at least two of denitrifying bacteria, Bacillus coagulans, Bacillus subtilis, Bacillus clausii, Bacillus indica, and Serratia.

[0011] Preferably, in step 2), the raw materials of the repair agent include the following components:

[0012] 25 parts of flocculant, 20 parts of activated carbon, 25 parts of calcium oxide, 15 parts of 9,10-bis(3,5-dihydroxyphenyl)anthracene, 8 parts of methoxyphenol, and 5 parts of adhesive.

[0013] Preferably, the repair agent is added in an amount according to a solid-liquid ratio of 1:100 to 300.

[0014] Preferably, the flocculant is a mixture of polyaluminium chloride, polyferric sulfate and polyacrylamide, and the mixing ratio of polyaluminium chloride, polyferric sulfate and polyacrylamide is 1-4:2-6:2-4.

[0015] Preferably, in step 3), the intermediate treatment liquid 2 is transported to the lower end of the anaerobic reactor, passes through the packing area in the middle of the anaerobic reactor in an upflow manner through the water distribution device, and flows out through the outlet at the upper end of the anaerobic reactor.

[0016] Preferably, the filler in the filler zone includes 20-40 parts of gasification slag, 10-20 parts of ceramsite, 5-10 parts of metallic iron, and 50-70 parts of activated sludge.

[0017] Preferably, the method for preparing the gasified slag comprises the following steps:

[0018] Step 1: crushing the raw coal to obtain coal particles, mixing the obtained coal particles with a water-coal slurry additive and a potassium hydroxide solution, heating to 100-200° C., reacting for 30-60 minutes, and obtaining a coal slurry;

[0019] Step 2: In a heating furnace, the obtained coal slurry is subjected to oxidation reaction in an air atmosphere for 3 to 6 hours at a reaction temperature of 200 to 250° C.; after the reaction is completed, the temperature is further raised to 800 to 950° C. in an inert gas atmosphere for reaction for 2 to 3 hours to obtain a carbonized material;

[0020] Step 3: introducing water vapor into the obtained carbonized material under an inert gas atmosphere, reacting at 850-950° C. for 3-6 hours to obtain gasified slag.

[0021] Preferably, in step one, the solid-liquid ratio of the raw coal and the potassium hydroxide solution is 1:0.3-0.6; the weight ratio of the added amount of the coal-water slurry additive to the raw coal is 1:80-100; the coal-water slurry additive is one or a combination of carboxymethyl cellulose and potassium sulfonate; the concentration of the potassium hydroxide solution is 15-30wt%.

[0022] Preferably, the organic pollutants include one or more of petroleum hydrocarbons, 2-chlorotoluene, benzyl anthracene, 2,4-dinitrotoluene, 1,2-dichlorobenzene, and 1,2-dichloroethane.

[0023] The beneficial effects of the present invention are:

[0024] The method for repairing groundwater containing organic pollutants provided by the present invention is to pump groundwater containing organic pollutants to the ground through multiple water pumps, then add divalent iron salt for pre-treatment, and then add a repair agent to quickly remove most of the organic pollutants in the groundwater, and also to treat some inorganic pollutants to a certain extent, with high treatment effect; specifically, the flocculant, 9,10-bis(3,5-dihydroxyphenyl)anthracene, methoxyphenol and other components in the repair agent are chemically reacted and absorbed with the organic matter in the groundwater, that is, the organic matter in the groundwater can be combined with 9,10-bis(3,5-dihydroxyphenyl)anthracene, methoxyphenol and the like through chemical bonds, and then combined with the flocculant to perform flocculation precipitation to remove most of the organic residues, and the substances that are not completely precipitated can also be combined with subsequent anaerobic reactors and aerobic tanks for treatment, and the remaining untreated organic matter can be further thoroughly treated, and the overall repair is more thorough. DETAILED DESCRIPTION

[0025] Many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art can make similar modifications without violating the connotation of the present invention, so the present invention is not limited to the specific implementation disclosed below.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0027] Example 1 Preparation of gasification slag

[0028] Step 1: crush the raw coal into 10-20 meshes to obtain coal particles, mix the obtained coal particles with a water-coal slurry additive at a weight ratio of 90:1, then add a potassium hydroxide solution at a solid-liquid ratio (g / ml) of 1:0.5 of coal particles to potassium hydroxide solution, mix evenly, heat to 150°C and react for 45 minutes to obtain a coal slurry; wherein the concentration of the potassium hydroxide solution is 20wt%; the water-coal slurry additive is a mixture of carboxymethyl cellulose and potassium sulfonate, and the mixing weight ratio is 1:3;

[0029] Step 2: In a heating furnace, the obtained coal slurry is subjected to oxidation reaction in an air atmosphere for 4 hours at a reaction temperature of 230°C; after the reaction is completed, the temperature is further raised to 870°C in a nitrogen atmosphere for 2.5 hours to obtain a carbonized material;

[0030] Step 3: The obtained carbonized material is introduced with water vapor under a nitrogen atmosphere and reacted at 900° C. for 5 hours to obtain gasification slag A.

[0031] The obtained gasification slag A was subjected to relevant measurements, and the indicators are as follows:

[0032] Specific surface area: 1327m 2 / g, measured according to standard GB / T7702.20-2008;

[0033] Bulk density: 0.51g / cm 3 , determined according to NY / T 1121.4-2006;

[0034] Saturated moisture content: 205%, measured in accordance with NY / T 1121.21-2008.

[0035] Example 2 Preparation of gasification slag

[0036] Step 1: crush the raw coal into 10-20 meshes to obtain coal particles, mix the obtained coal particles and the water-coal slurry additive in a weight ratio of 100:1, then add potassium hydroxide solution in a ratio of 1:0.4 of coal particles to potassium hydroxide solution solid-liquid ratio (g / ml), mix evenly, heat to 200°C and react for 30 minutes to obtain coal slurry; wherein the concentration of potassium hydroxide solution is 30wt%; the water-coal slurry additive is a mixture of carboxymethyl cellulose and potassium sulfonate, and the mixing weight ratio is 1:2;

[0037] Step 2: In a heating furnace, the obtained coal slurry is subjected to oxidation reaction in an air atmosphere for 3 hours at a reaction temperature of 250°C; after the reaction is completed, the temperature is further raised to 950°C in an inert gas atmosphere for reaction for 2 hours to obtain a carbonized material;

[0038] Step 3: In an inert gas atmosphere, water vapor is introduced into the obtained carbonized material, and the reaction is carried out at 950° C. for 3.5 hours to obtain gasification slag B.

[0039] The obtained gasification slag B was subjected to relevant measurements, and the indicators are as follows:

[0040] Specific surface area: 1405m 2 / g, measured according to standard GB / T7702.20-2008;

[0041] Bulk density: 0.48g / cm 3 , determined according to NY / T 1121.4-2006;

[0042] Saturated moisture content: 198%, measured in accordance with NY / T 1121.21-2008.

[0043] Example 3 Preparation of gasification slag

[0044] Step 1: crush the raw coal into 10-20 meshes to obtain coal particles, mix the obtained coal particles and the water-coal slurry additive in a weight ratio of 80:1, then add potassium hydroxide solution in a ratio of coal particles to potassium hydroxide solution solid-liquid ratio (g / ml) of 1:0.6, mix evenly, heat to 120°C and react for 60 minutes to obtain coal slurry; wherein the concentration of the potassium hydroxide solution is 15wt%; the water-coal slurry additive is a mixture of carboxymethyl cellulose and potassium sulfonate, and the mixing weight ratio is 1:4;

[0045] Step 2: In a heating furnace, the obtained coal slurry is subjected to oxidation reaction in an air atmosphere for 5 hours at a reaction temperature of 210°C; after the reaction is completed, the temperature is further raised to 820°C in an inert gas atmosphere for reaction for 3 hours to obtain a carbonized material;

[0046] Step 3: In an inert gas atmosphere, water vapor is introduced into the obtained carbonized material, and the reaction is carried out at 870° C. for 5.5 hours to obtain gasification slag C.

[0047] The obtained gasification slag C was subjected to relevant measurements, and the indicators are as follows:

[0048] Specific surface area: 1357m 2 / g, measured according to standard GB / T7702.20-2008;

[0049] Bulk density: 0.47g / cm 3 , determined according to NY / T 1121.4-2006;

[0050] Saturated moisture content: 210%, measured in accordance with NY / T 1121.21-2008.

[0051] Example 4 Preparation of gasification slag

[0052] The difference between this embodiment and embodiment 1 is that the potassium hydroxide solution in step 1 is replaced with pure water in equal amount. The other steps and parameters remain unchanged. Gasification slag D is prepared.

[0053] The obtained gasification slag D was subjected to relevant measurements, and the indicators were as follows:

[0054] Specific surface area: 1208m 2 / g, measured according to standard GB / T7702.20-2008;

[0055] Bulk density: 0.72g / cm3, measured according to NY / T 1121.4-2006;

[0056] Saturated moisture content: 132%, measured in accordance with NY / T 1121.21-2008.

[0057] Example 5 Groundwater Remediation

[0058] The groundwater of a garbage disposal site was selected as the treatment object.

[0059] First, it is extracted through multiple extraction pumps, and the content of each pollutant therein is measured, as shown in Table 1 below:

[0060] Table 1: Groundwater quality of a waste treatment plant

[0061] Pollutants Pollutant content unit Petroleum hydrocarbons 279350 μg / L Halogenated hydrocarbons 28510 μg / L Benzopyrene 57.6 μg / L 2,4-Dinitrotoluene 64.2 μg / L chromium 714 μg / L COD 3552 mg / L

[0062] 1) adding ferrous sulfate to groundwater containing organic pollutants at a liquid-solid ratio of 120 mL:1 g; after mixing, adjusting the pH value of the system to about 7 to obtain an intermediate treatment solution 1;

[0063] 2) Adding a repair agent to the obtained intermediate treatment liquid 1 at a liquid-to-solid ratio of 200 mL:1 g, mixing and stirring for 5 hours to obtain an intermediate treatment liquid 2;

[0064] The repair agent includes the following components: 25 parts of flocculant, 20 parts of activated carbon, 25 parts of calcium oxide, 15 parts of 9,10-bis(3,5-dihydroxyphenyl)anthracene, 8 parts of methoxyphenol, and 5 parts of adhesive;

[0065] The flocculant is obtained by mixing polyaluminium chloride, polyferric sulfate and polyacrylamide in a weight ratio of 2:3:2; the binder is cellulose acetate;

[0066] 3) The intermediate treatment liquid II is first transported to the lower end of the anaerobic reactor, passes through the packing area in the middle of the anaerobic reactor through the water distribution device in an upflow manner, and flows out through the outlet at the upper end of the anaerobic reactor; the outflowing groundwater is then transported to the aerobic pool for further treatment, and the treatment is completed and the discharge is up to standard;

[0067] The initial filler of the anaerobic reactor includes the following components: 35 parts of gasification slag A (prepared in Example 1), 15 parts of ceramsite, 8 parts of metallic iron, and 60 parts of activated sludge;

[0068] The activated sludge contains microorganisms, including Pseudomonas, Bacillus subtilis, Bacillus clausii, Bacillus indica, Serratia and other microorganisms; and the ratio of the number of live bacteria of Pseudomonas, Bacillus subtilis, Bacillus clausii, Bacillus indica and Serratia is 1:1.5:0.8:0.5:0.7.

[0069] The pollutants in the repaired groundwater (water from the aerobic pool) were measured, and the results are shown in Table 2 below:

[0070] Table 2: Water quality after treatment

[0071] Pollutants Content after treatment unit Removal rate Petroleum hydrocarbons 1108 μg / L 99.6％ Halogenated hydrocarbons 132 μg / L 99.54％ Benzopyrene 0.37 μg / L 99.35％ 2,4-Dinitrotoluene 0 μg / L 100％ chromium 47 μg / L 98.62％ COD 26.4 mg / L 98.13％

[0072] Example 6

[0073] The groundwater of an industrial pollution site was selected as the treatment object.

[0074] First, it is extracted through multiple extraction pumps, and the content of each pollutant therein is measured, as shown in Table 3 below:

[0075] Table 3: Groundwater quality at an industrial contaminated site

[0076]

[0077]

[0078] 1) adding ferrous sulfate to groundwater containing organic pollutants at a liquid-solid ratio of 180 mL:1 g; after mixing, adjusting the pH value of the system to about 7 to obtain an intermediate treatment solution 1;

[0079] 2) Adding a repair agent to the obtained intermediate treatment liquid 1 at a liquid-to-solid ratio of 300 mL:1 g, mixing and stirring for 3 hours to obtain an intermediate treatment liquid 2;

[0080] The repair agent includes the following components: 30 parts of flocculant, 25 parts of activated carbon, 30 parts of calcium oxide, 20 parts of 9,10-bis(3,5-dihydroxyphenyl)anthracene, 10 parts of methoxyphenol, and 6 parts of adhesive;

[0081] The flocculant is obtained by mixing polyaluminium chloride, polyferric sulfate and polyacrylamide in a weight ratio of 2:4:3; the binder is cellulose acetate;

[0082] 3) The intermediate treatment liquid II is first transported to the lower end of the anaerobic reactor, passes through the packing area in the middle of the anaerobic reactor through the water distribution device in an upflow manner, and flows out through the outlet at the upper end of the anaerobic reactor; the outflowing groundwater is then transported to the aerobic pool for further treatment, and the treatment is completed and the discharge is up to standard;

[0083] The initial filler of the anaerobic reactor includes the following components: 40 parts of gasification slag B (prepared in Example 2), 20 parts of ceramsite, 10 parts of metallic iron, and 70 parts of activated sludge;

[0084] The activated sludge contains microorganisms, including Pseudomonas, Bacillus subtilis, Bacillus clausii, Bacillus coagulans, Serratia and other microorganisms; and the ratio of the number of live bacteria of Pseudomonas, Bacillus subtilis, Bacillus clausii, Bacillus indica and Serratia is 1:1.5:0.8:0.5:0.7.

[0085] The pollutants in the repaired groundwater (water from the aerobic pool) were measured, and the results are shown in Table 4 below:

[0086] Table 4: Water quality after restoration

[0087]

[0088]

[0089] Example 7

[0090] The water quality treated in this embodiment is consistent with that in embodiment 5;

[0091] The repair method is basically the same; the only difference is that the components of the repair agent and the filler components in the anaerobic reactor are adjusted, specifically:

[0092] The repair agent includes the following components: 20 parts of flocculant, 15 parts of activated carbon, 20 parts of calcium oxide, 10 parts of 9,10-bis(3,5-dihydroxyphenyl)anthracene, 5 parts of methoxyphenol, and 4 parts of adhesive;

[0093] The flocculant is obtained by mixing polyaluminium chloride, polyferric sulfate and polyacrylamide in a weight ratio of 4:2:3; the binder is cellulose acetate;

[0094] The initial filler of the anaerobic reactor includes the following components: 25 parts of gasification slag C (prepared in Example 3), 10 parts of ceramsite, 6 parts of metallic iron, and 55 parts of activated sludge;

[0095] The activated sludge contains microorganisms, including Pseudomonas, Bacillus subtilis, Bacillus clausii, Bacillus indica, Serratia and other microorganisms; and the ratio of the number of live bacteria of Pseudomonas, Bacillus subtilis, Bacillus clausii, Bacillus indica and Serratia is 1:1.5:0.8:0.5:0.7.

[0096] The pollutants in the repaired groundwater (water from the aerobic pool) were measured, and the results are shown in Table 5 below:

[0097] Table 5: Water quality after restoration

[0098] Pollutants Content after treatment unit Removal rate Petroleum hydrocarbons 1229 μg / L 99.56％ Halogenated hydrocarbons 162 μg / L 99.43％ Benzopyrene 0.42 μg / L 99.27％ 2,4-Dinitrotoluene 0 μg / L 100％ chromium 8.8 μg / L 98.57％ COD 69 mg / L 98.06％

[0099] Comparative Example 1

[0100] The water quality treated in this embodiment is consistent with that in embodiment 5;

[0101] The repair method is also basically the same; the only difference is that step 2) is omitted; that is, the intermediate treatment liquid obtained after the treatment in step 1) is directly transported to the lower end of the anaerobic reactor for subsequent treatment.

[0102] The pollutants in the aerobic pool effluent were measured, and the results are shown in Table 6 below:

[0103] Table 6: Water quality after treatment

[0104] Pollutants Content after treatment unit Removal rate Petroleum hydrocarbons 41288 μg / L 85.22％ Halogenated hydrocarbons 3050 μg / L 89.3％ Benzopyrene 25 μg / L 56.6％ 2,4-Dinitrotoluene 11.1 μg / L 82.7％ chromium 125 μg / L 79.6％ COD 612 mg / L 82.77％

[0105] Comparative Example 2

[0106] The water quality treated in this embodiment is consistent with that in embodiment 6;

[0107] The repair method is also basically the same; the only difference is that step 3 is omitted). That is, only steps 1 and 2 are processed.

[0108] The water quality after treatment was measured, and the results are shown in Table 7 below:

[0109] Table 7:

[0110]

[0111]

[0112] Comparative Example 3

[0113] The water quality treated in this embodiment is consistent with that in embodiment 5;

[0114] The repair method is basically the same; the only difference is to adjust the filler components in the anaerobic reactor, specifically:

[0115] The gasification slag A was replaced by the gasification slag D prepared in Example 4 in equal amounts.

[0116] The water quality after treatment was measured, and the results are shown in Table 8 below:

[0117] Table 8:

[0118] Pollutants Content after treatment unit Removal rate Petroleum hydrocarbons 28400 μg / L 89.48％ Halogenated hydrocarbons 2560 μg / L 91.02％ Benzopyrene 5.95 μg / L 89.67％ 2,4-Dinitrotoluene 7.2 μg / L 88.79％ chromium 61 μg / L 91.45％ COD 305 mg / L 91.41％

[0119] In summary, it can be seen that the remediation method provided by the present invention can achieve a removal rate of more than 98% for organic pollutants and some inorganic pollutants such as heavy metals in groundwater, the overall remediation treatment efficiency is high, and the remediation is more comprehensive and thorough.

[0120] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for remediating groundwater containing organic pollutants, characterized in that: The following steps are involved: 1) Extract the groundwater containing organic pollutants through multiple extraction pumps, add divalent iron salt at a solid-liquid ratio of 1:50-200, mix well, and adjust the pH value of the system to 6-8 to obtain intermediate treatment solution 1; 2) Add a repairing agent to the obtained intermediate treatment liquid 1, mix and stir to react for 3 to 6 hours, and obtain an intermediate treatment liquid 2; the raw materials of the repairing agent include the following components: 20-30 parts of flocculant, 15-25 parts of activated carbon, 20-30 parts of calcium oxide, 10-20 parts of 9,10-bis(3,5-dihydroxyphenyl)anthracene, 5-10 parts of methoxyphenol, 3-6 parts of adhesive; 3) The intermediate treatment liquid II is sequentially passed into an anaerobic reactor and an aerobic tank for treatment, and discharged after meeting the standards; the filler of the anaerobic reactor contains microorganisms, and the microorganisms include at least two of denitrifying bacteria, Bacillus coagulans, Bacillus subtilis, Bacillus clausii, Bacillus indica, and Serratia.

2. The method for remediating groundwater containing organic pollutants according to claim 1, characterized in that: In step 2), the raw materials of the repair agent include the following components: 25 parts of flocculant, 20 parts of activated carbon, 25 parts of calcium oxide, 15 parts of 9,10-bis(3,5-dihydroxyphenyl)anthracene, 8 parts of methoxyphenol, and 5 parts of adhesive.

3. The method for remediating groundwater containing organic pollutants according to claim 1, characterized in that: The repair agent is added in an amount according to a solid-liquid ratio of 1:100-300.

4. The method for remediating groundwater containing organic pollutants according to claim 2, characterized in that: The flocculant is a mixture of polyaluminium chloride, polyferric sulfate and polyacrylamide, and the mixing ratio of polyaluminium chloride, polyferric sulfate and polyacrylamide is 1-4:2-6:2-4.

5. The method for remediating groundwater containing organic pollutants according to claim 1, characterized in that: In step 3), the intermediate treatment liquid 2 is transported to the lower end of the anaerobic reactor, passes through the packing area in the middle of the anaerobic reactor in an upflow manner through the water distribution device, and flows out through the outlet at the upper end of the anaerobic reactor.

6. The method for remediating groundwater containing organic pollutants according to claim 5, characterized in that: The filler in the filler area includes 20-40 parts of gasification slag, 10-20 parts of ceramsite, 5-10 parts of metallic iron and 50-70 parts of activated sludge.

7. The method for remediating groundwater containing organic pollutants according to claim 6, characterized in that: The method for preparing the gasification slag comprises the following steps: Step 1: crush the raw coal to obtain coal particles, mix the obtained coal particles with a water-coal slurry additive and a potassium hydroxide solution, heat to 100-200° C., react for 30-60 minutes, and obtain a coal slurry; Step 2: In a heating furnace, the obtained coal slurry is subjected to oxidation reaction in an air atmosphere for 3 to 6 hours at a reaction temperature of 200 to 250°C; after the reaction is completed, the temperature is further raised to 800 to 950°C in an inert gas atmosphere for 2 to 3 hours to obtain a carbonized material; Step 3: In an inert gas atmosphere, water vapor is introduced into the obtained carbonized material, and the reaction is carried out at 850-950°C for 3-6 hours to obtain gasified slag.

8. The method for remediating groundwater containing organic pollutants according to claim 7, characterized in that: In step one, the solid-liquid ratio of the raw coal and the potassium hydroxide solution is 1:0.3~0.6; the weight ratio of the added amount of the water-coal slurry additive to the raw coal is 1:80~100; the water-coal slurry additive is one or a combination of carboxymethyl cellulose and potassium sulfonated humate; the concentration of the potassium hydroxide solution is 15~30wt%.

9. The method for remediating groundwater containing organic pollutants according to any one of claims 1 to 8, characterized in that: The organic pollutants include: one or more of petroleum hydrocarbons, halogenated hydrocarbons, benzopyrene, and 2,4-dinitrotoluene.

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